Vibration-rotation transition of $NH_{2}$ in the $\tilde{A}^{2}A_{1}$ state were observed with sub-Doppler resolution by using a dye laser and a $CO_{2}/N_{2}O$ laser combined with the laser magnetic resonance technique. The cw dye laser output (Rh 6G, 70 mW) was introduced into a fluorescence cell placed in the $CO_{2}/N_{2}O$ laser cavity through a ZnSe partial reflector. The infrared laser was modulated by an intracavity chopper, and the double resonance signal was observed as a change in fluorescence intensity by using a phase-sensitive detector. When the dye laser pumped the $\tilde{A}^{2}A_{1}(090)2_{2\ 0}- \tilde{X}^{2}B_{1} (000)1_{1\ 0}$ transition $29 M_{J}$ components of $(0 10 0) 2_{11} - (090)2_{2\ 0}$ in {\AA} were observed by sweeping the magnetic field. An analysis of the observed spectra revealed a large change in the orbital magnetic g-factor along the a-axis, $g\ell^{aa}$, between the $v_{2}=9$ and 10 vibrational state: -0.1246 (39) and -0. 0506(55) in (090) and (0 10 0), respectively. Three additional lines which corresponded to changes in fluorescence intensity opposite in sign to those for the 29 M components mentioned above, were also observed and tentatively assigned to transition from $\tilde{A}^{2} A_{1}$ (090) to a highly excited vibrational state of $\tilde{X}$.

Description:

Author Institution:

URI:

http://hdl.handle.net/1811/11472

Other Identifiers:

1980-WG-6

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